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comparison libtomcrypt/src/pk/rsa/rsa_export.c @ 285:1b9e69c058d2

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propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3) to branch 'au.asn.ucc.matt.dropbear' (head fdf4a7a3b97ae5046139915de7e40399cceb2c01)
author Matt Johnston <matt@ucc.asn.au>
date Wed, 08 Mar 2006 13:23:58 +0000
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children 0cbe8f6dbf9e
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281:997e6f7dc01e 285:1b9e69c058d2
1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
2 *
3 * LibTomCrypt is a library that provides various cryptographic
4 * algorithms in a highly modular and flexible manner.
5 *
6 * The library is free for all purposes without any express
7 * guarantee it works.
8 *
9 * Tom St Denis, [email protected], http://libtomcrypt.org
10 */
11 #include "tomcrypt.h"
12
13 /**
14 @file rsa_export.c
15 Export RSA PKCS keys, Tom St Denis
16 */
17
18 #ifdef MRSA
19
20 /**
21 This will export either an RSAPublicKey or RSAPrivateKey [defined in PKCS #1 v2.1]
22 @param out [out] Destination of the packet
23 @param outlen [in/out] The max size and resulting size of the packet
24 @param type The type of exported key (PK_PRIVATE or PK_PUBLIC)
25 @param key The RSA key to export
26 @return CRYPT_OK if successful
27 */
28 int rsa_export(unsigned char *out, unsigned long *outlen, int type, rsa_key *key)
29 {
30 int err;
31 unsigned long zero=0;
32
33 LTC_ARGCHK(out != NULL);
34 LTC_ARGCHK(outlen != NULL);
35 LTC_ARGCHK(key != NULL);
36
37 /* type valid? */
38 if (!(key->type == PK_PRIVATE) && (type == PK_PRIVATE)) {
39 return CRYPT_PK_INVALID_TYPE;
40 }
41
42 if (type == PK_PRIVATE) {
43 /* private key */
44 /* output is
45 Version, n, e, d, p, q, d mod (p-1), d mod (q - 1), 1/q mod p
46 */
47 if ((err = der_encode_sequence_multi(out, outlen,
48 LTC_ASN1_SHORT_INTEGER, 1UL, &zero,
49 LTC_ASN1_INTEGER, 1UL, &key->N,
50 LTC_ASN1_INTEGER, 1UL, &key->e,
51 LTC_ASN1_INTEGER, 1UL, &key->d,
52 LTC_ASN1_INTEGER, 1UL, &key->p,
53 LTC_ASN1_INTEGER, 1UL, &key->q,
54 LTC_ASN1_INTEGER, 1UL, &key->dP,
55 LTC_ASN1_INTEGER, 1UL, &key->dQ,
56 LTC_ASN1_INTEGER, 1UL, &key->qP,
57 LTC_ASN1_EOL, 0UL, NULL)) != CRYPT_OK) {
58 return err;
59 }
60
61 /* clear zero and return */
62 return CRYPT_OK;
63 } else {
64 /* public key */
65 return der_encode_sequence_multi(out, outlen,
66 LTC_ASN1_INTEGER, 1UL, &key->N,
67 LTC_ASN1_INTEGER, 1UL, &key->e,
68 LTC_ASN1_EOL, 0UL, NULL);
69 }
70 }
71
72 #endif /* MRSA */
73
74 /* $Source: /cvs/libtom/libtomcrypt/src/pk/rsa/rsa_export.c,v $ */
75 /* $Revision: 1.11 $ */
76 /* $Date: 2005/06/04 01:42:48 $ */